What is the first course of action when drilling hardened receivers?

When drilling hardened receivers, the recommended first course of action is to use a rotary tool to grind the surface of the receiver. This method is beneficial because hardened materials can be extremely tough and may quickly dull standard drill bits. By grinding the surface, you create a more manageable area for the drill bit to engage with, reducing the risk of damaging the bit or the material.

Starting with a smaller drill bit is a common practice for many drilling applications, but it may not be the most effective method for hardened materials where initial penetration is difficult. Applying lubricant might enhance the drilling process, but without first preparing the surface, it may not reach its full potential benefit against the toughness of the material. Similarly, while a hammer drill can be useful for some hard materials, it is not the optimal first choice for dealing with hardened receivers where precision and bit longevity are critical.